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Problems on Trains
A train travelling at a speed of 75 mph enters a tunnel 3½ miles long. The train is ¼ mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?
2.5 min
3 min
3.2 min
3.5 min
Correct Answer:
3 min
Explanation:
Total distance covered
=
❨
7
+
1
❩
miles
2
4
=
15
miles.
4
∴ Time taken
=
❨
15
❩
hrs
4 x 75
=
1
hrs
20
=
❨
1
x 60
❩
min.
20
= 3 min.
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